I have been teaching economics for the past year and so am looking all over for ancillaries to add to my classes. Even though I have created a set of flipped videos, I found this set by Jason Welker which is quite good. He teaches IB Ecomomics, but you could still use his for AP. Jason also has a super website with his class PowerPoints, student wikis, flashcards and his blog. The embedded video above tells you how to navigate his website.